<template>
  <div class="swiper-container" ref="slider">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for="(slider,index) in skuImageList" :key="slider.id">
        <img :src="slider.imgUrl"
             :class="{active:index==currentIndex}"
             @click="changeCurrentIndex(index)"
        >
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>


import Swiper from 'swiper'

export default {
  name: "ImageList",
  props: ['skuImageList'],
  data(){
    return{
      currentIndex:0,
    }
  },
  watch:{
    skuImageList:{
      immediate:true,
      handler(){
        //nextTick
        this.$nextTick(()=>{
          var mySwiper = new Swiper (this.$refs.slider, {
            slidesPerView : 4,//轮播框里一次显示几个slider
            slidesPerGroup : 2,//每一次轮播几个slider
            // 如果需要前进后退按钮
            navigation: {
              nextEl: '.swiper-button-next',
              prevEl: '.swiper-button-prev',
            },
          })
        })
      }
    }
  },
  methods:{
    changeCurrentIndex(index){
      //第一个点击事件，在录播框中点击图片获得高亮效果
      this.currentIndex=index;
      //第二个点击事件，点击轮播框中的图片后兄弟组件<ImageList/>中更新为所点击图片
      //派发全局事件
      this.$bus.$emit('getIndex',index)
    }
  }
}
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;

    &::after {
      font-size: 12px;
    }
  }
</style>